【单选题】CDMA和GSM()通信系统属于蜂窝移动通信系统。
【单选题】According to the passage, Green Peak ______.
A.
is the first company to install wireless sensor networks
B.
promotes the application of wireless sensor networks
C.
supplies batteries operating on harvested energy
D.
benefits handsomely from communication technology
【单选题】Tickets are imited andwill be allocated to those who apply first.
【判断题】GSM属于第二代移动通信系统,主要业务是语音通信业务。WCDMA属于第三代移动通信系统,是最先进的移动通信系统,因此,不提供语音通信业务。
【单选题】栽培于土壤中的农作物 , 能吸收土壤中的氮、磷、钾等营养物质 , 而又能抑制有 害物质进入植物体 , 主要是由于 ( )
【单选题】It's prudent to start any exercise program gradually at first.
【简答题】Which parts of a training program would it be important to do first? (Why? / Why not?)
【简答题】Why was his father disappointed with him at first?